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Dear R users, In order to illustrate the possible effects of events on variables plotted against time, I would like plot a time line of events along side the plot of the variables. The x-axis should be some time unit; the y-axis should be the variable of interest; the time line should be plotted below the graph along the same x-axis scale. As I have many variables and different events

What I want to do is create a horizontal bar chart matrix for a set of data that have a common set of variables (e.g., % of As, % of Bs, etc.) listed on the Y-axis and groups (e.g., Classes) on the X-axis. The key here is that the bars for each individual class plot are "centered" rather than left or right-justified. In archaeology plots similar to this are called battleship curves or